JPH02257420A - Magnetic recording medium having excellent electromagnetic conversion characteristics against environment - Google Patents
Magnetic recording medium having excellent electromagnetic conversion characteristics against environmentInfo
- Publication number
- JPH02257420A JPH02257420A JP1079307A JP7930789A JPH02257420A JP H02257420 A JPH02257420 A JP H02257420A JP 1079307 A JP1079307 A JP 1079307A JP 7930789 A JP7930789 A JP 7930789A JP H02257420 A JPH02257420 A JP H02257420A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- layer
- magnetic recording
- conversion characteristics
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- 229920001059 synthetic polymer Polymers 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、磁気テープ、磁気ディスク、磁気７０ツピー
デイスク等の磁気記録媒体、特に電磁変換特性その他の
特性に優れていて、ビデオテープとして好適に用いられ
る磁気記録媒体に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to magnetic recording media such as magnetic tapes, magnetic disks, and magnetic 70 disks, which have particularly excellent electromagnetic conversion characteristics and other characteristics, and are suitable as video tapes. The present invention relates to magnetic recording media used for.
近年、磁気記録媒体においては、高密度化への要望が高
まり、特に、たとえばビデオテープにおいては記録周波
数の高域化への要望に伴い、非常に高密度の記録を行う
ことが要求され、支持体上に上層および下層からなる二
層構造あるいは三層以上の構造（以下、これらを総称し
て多重層構造ということもある。）から成る磁性層を設
けたものが種々提案されている。In recent years, there has been an increasing demand for higher densities in magnetic recording media, and in particular, with the demand for higher recording frequencies in video tapes, extremely high-density recording is required and support is increasing. Various types of devices have been proposed in which a magnetic layer is provided on the magnetic body with a two-layer structure consisting of an upper layer and a lower layer, or a structure with three or more layers (hereinafter, these may be collectively referred to as a multilayer structure).
よく知られているように、磁気記録媒体は、通常、結合
剤（バインダー）といわれる合成または天然の各種高分
子材料（いわゆる樹脂材料）中に、強磁性体の粉末、研
磨剤、カーボンブラック、潤滑剤、分散剤および硬化剤
その他の成分を均一に分散させたものに、必要に応じて
適宜溶剤を添加し、得られた磁性塗料を支持体上に塗布
して磁性層を形成させ、ついで磁性層を磁場配向させた
のち乾燥することによって製造される。As is well known, magnetic recording media usually contain ferromagnetic powder, abrasives, carbon black, etc. in various synthetic or natural polymer materials (so-called resin materials) called binders. A suitable solvent is added to a uniformly dispersed mixture of lubricants, dispersants, hardeners, and other components as required, and the resulting magnetic paint is applied onto a support to form a magnetic layer. It is manufactured by aligning the magnetic layer in a magnetic field and then drying it.
磁気記録媒体の電磁変換特性その他の特性に影響を及ぼ
す因子として種々の因子があり、その代表的なものとし
て、用いられる各成分の種類や使用量が挙げられ、これ
らの因子がお互いに相関し合って磁気記録媒体の特性に
影響を及ぼしている。There are various factors that affect the electromagnetic conversion characteristics and other characteristics of magnetic recording media. Typical examples include the type and amount of each component used, and it is important to note that these factors are correlated with each other. This also affects the characteristics of magnetic recording media.
ところで、従来、磁気記録媒体の特性を改善するため、
使用される各成分の組成やその割合を種々変化させたも
のが数多く提案されているが、まだ十分満足すべき特性
を備えたものが見当たらないのが現状である。By the way, conventionally, in order to improve the characteristics of magnetic recording media,
Many products have been proposed in which the compositions and ratios of the various components used are varied, but at present no product with sufficiently satisfactory properties has yet been found.
かかる実情に鑑み、本発明者らは、優れた電磁変換特性
を有すると共に、高温、高湿下のような苛酷な条件の下
においても、高い水準の電磁変換特性を維持することが
できる耐環境性の優れた磁気記録媒体、特に、ビデオテ
ープとして好適に用いられる多重層テープを開発しよう
として種々研究した結果、次に示す磁気記録媒体がその
目的に適ったものであることを見出し、本発明に到達し
た。In view of these circumstances, the present inventors developed an environment-resistant product that has excellent electromagnetic conversion characteristics and can maintain a high level of electromagnetic conversion characteristics even under harsh conditions such as high temperature and high humidity. As a result of various studies in an attempt to develop a magnetic recording medium with excellent properties, particularly a multilayer tape suitable for use as a video tape, it was discovered that the following magnetic recording medium was suitable for the purpose, and the present invention has been made. reached.
すなわち本発明は、非磁性支持体上に多重層を設けて成
る磁気記録媒体において、最上層中の磁性体がＦｅ−Ａ
Ｑ系強磁性合金粉末であり、かつ最上層に隣接する層中
の磁性体がＦｅ−Ｎｉ系強磁性合金粉末であることを特
徴とする磁気記録媒体に係るものである。That is, the present invention provides a magnetic recording medium comprising multiple layers on a non-magnetic support, in which the magnetic material in the uppermost layer is Fe-A.
The present invention relates to a magnetic recording medium characterized in that it is a Q-based ferromagnetic alloy powder, and the magnetic material in the layer adjacent to the top layer is an Fe-Ni-based ferromagnetic alloy powder.
以下、本発明について説明する。The present invention will be explained below.
従来、この種の磁気記録媒体に用いられる強磁性体とし
て、たとえばγ−Ｆｅ、０１、ｃｏ含含有−Ｆｅ２０３
またはＣｏ被被着−Ｆｅ２０３のようなＣＯ−γ−Ｆｅ
ｌＯ，、Ｆｅ５０いＣｏ含有Ｆｅ、Ｏ，またはＣＯ被着
Ｆｅ、０４のようなＣｏ−γ−Ｆｅ＝Ｏａ、 Ｃｒｙ、
等の酸化物磁性体、その他、Ｆｅ。Conventionally, as a ferromagnetic material used in this type of magnetic recording medium, for example, γ-Fe, 01, co-containing -Fe203
or Co-coated-CO-γ-Fe such as Fe203
lO,, Fe50 Co-containing Fe, O, or CO coated Fe, Co-γ-Fe=Oa, Cry,
oxide magnetic materials such as, others, Fe.
Ｎｉ、 Ｆｅ−Ｎｉ合金、Ｆｅ−Ｃｏ合金、Ｆｅ−Ｎ１
−Ｐ合金、Ｆｅ−Ｎ１−Ｃｏ合金、Ｆｅ−Ｍｎ−Ｚｎ合
金、Ｆｅ−Ｎｉ−Ｚｎ合金 Ｆｅ−Ｃｏ−Ｎｉ−Ｃｒ合
金、Ｆｅ−Ｇｏ＝Ｎｉ−Ｐ合金、Ｇｏ−Ｐ合金、Ｃｏ−
Ｃｒ合金等のＦｅ、 Ｎｉ、 Ｃｏを主成分とするメタ
ル磁性粉等各種の強磁性体（粉末）が提案されており、
これらの金属磁性体には、添加剤として、Ｓｉ、 Ｃｕ
、 Ｚｎ、 Ａｎ、Ｐ、 Ｍｎ、 Ｃｒ等の元素又はこ
れらの化合物を含ませてもよいとされている。Ni, Fe-Ni alloy, Fe-Co alloy, Fe-N1
-P alloy, Fe-N1-Co alloy, Fe-Mn-Zn alloy, Fe-Ni-Zn alloy Fe-Co-Ni-Cr alloy, Fe-Go=Ni-P alloy, Go-P alloy, Co-
Various ferromagnetic materials (powders) such as metal magnetic powders mainly composed of Fe, Ni, and Co such as Cr alloys have been proposed.
These metal magnetic materials contain Si, Cu as additives.
It is said that elements such as , Zn, An, P, Mn, and Cr, or compounds thereof may be included.
本発明の磁気記録媒体においては、最上層中の磁性体が
Ｆｅ−ＡＱ系強磁性体合金粉末であり、かつ最上層に隣
接する層中の磁性体がＦｅ−Ｎｉ系強磁性体合金粉末で
あることを必須の要件とする。In the magnetic recording medium of the present invention, the magnetic material in the top layer is Fe-AQ ferromagnetic alloy powder, and the magnetic material in the layer adjacent to the top layer is Fe-Ni ferromagnetic alloy powder. Make certain things an essential requirement.
う
しかし、本発明の効果を損なわない限り、上記の必須成
分と共に、前述の公知の任意の強磁性体を最上層および
最上層に隣接する磁性層中に含有させることもできる。However, as long as the effects of the present invention are not impaired, any of the above-mentioned known ferromagnetic substances can be contained in the uppermost layer and the magnetic layer adjacent to the uppermost layer, together with the above-mentioned essential components.
また、本発明の磁気記録媒体においては、効果の点から
最上層および最上層に隣接する層中に、結合剤（バイン
ダー）として官能基を含有する樹脂を含有させることが
好ましい。Further, in the magnetic recording medium of the present invention, from the viewpoint of effectiveness, it is preferable that a resin containing a functional group is contained as a binder in the uppermost layer and a layer adjacent to the uppermost layer.
用いられる官能基を含有する樹脂としては種々のものが
あるが、その好適なものとして、たとえばスルホン酸カ
リウム含有塩化ビニル系樹脂、スルホン酸ナトリウム含
有ポリウレタン系樹脂等が挙げられる。There are various resins containing functional groups that can be used, and suitable examples include vinyl chloride resins containing potassium sulfonate, polyurethane resins containing sodium sulfonate, and the like.
また、従来、この種の磁気記録媒体に用いられる結合剤
として種々のものが提案されているが、本発明において
は、本発明の効果を損なわない限り、最上層および最上
層°に隣接する磁性層に、上記の官能基を含有する樹脂
と共に公知の任意の結合剤を含有させることもできる。In addition, although various binders have been proposed for use in this type of magnetic recording medium, in the present invention, as long as the effects of the present invention are not impaired, magnetic The layer can also contain any known binder along with the resin containing the functional groups described above.
このような結合剤の好適なものとして、たとえば、耐摩
耗性のあるポリウレタンが挙げられる。Suitable such binders include, for example, abrasion-resistant polyurethanes.
このポリウレタンは、他の物質に対する接着力が強く、
反復して加わる応用力または屈曲に耐えて機械的に強靭
であり、且つ耐摩耗性、耐候性が良好である。This polyurethane has strong adhesion to other substances,
It is mechanically strong and can withstand repeated applied force or bending, and has good abrasion resistance and weather resistance.
またポリウレタンの他に、繊維素系樹脂及び塩化ビニル
系共重合体を併用すれば、磁性層中の磁性粉の分散性が
向上してその機械的強度が増大する。Furthermore, if a cellulose resin and a vinyl chloride copolymer are used in combination with polyurethane, the dispersibility of the magnetic powder in the magnetic layer will be improved and its mechanical strength will be increased.
但し、繊維素系樹脂及び塩化ビニル系共重合体のみでは
層が硬くなりすぎるが、これは上述のポリウレタンの存
在によって防止できる。However, if only the cellulose resin and the vinyl chloride copolymer are used, the layer becomes too hard, but this can be prevented by the presence of the above-mentioned polyurethane.
使用可能な繊維素系樹脂として、セルロースエーテル、
セルロース無機酸エステル、セルロース有機酸エステル
等が知られている。Usable cellulose resins include cellulose ether,
Cellulose inorganic acid esters, cellulose organic acid esters, etc. are known.
上記のポリウレタン、塩化ビニル系共重合体は、部分的
に加水分解されていてもよい。The above polyurethane and vinyl chloride copolymers may be partially hydrolyzed.
塩化ビニル系恭重合体として、好ましくは、塩化ビニル
−酢酸ビニルを含む共重合体または塩化ビニル−酢酸ビ
ニルービニルアルコールヲ含む共重合体が挙げられる。Preferred vinyl chloride-based polymers include copolymers containing vinyl chloride and vinyl acetate, and copolymers containing vinyl chloride and vinyl acetate and vinyl alcohol.
またフェノキシ樹脂も使用することができる。Phenoxy resins can also be used.
フェノキシ樹脂は機械的強度が大きく、寸法安定性にす
ぐれ、耐熱、耐水、耐薬品性がよく、接着性がよい等の
長所を有する。Phenoxy resin has advantages such as high mechanical strength, excellent dimensional stability, good heat resistance, water resistance, chemical resistance, and good adhesiveness.
これらの長所は前記したポリウレタンと長短相補って磁
気記録媒体の物性の経時安定性を著しく高めることがで
きる。These advantages are complementary to those of the polyurethane described above, and the stability of the physical properties of the magnetic recording medium over time can be significantly improved.
更に上記の結合剤の他、熱可塑性樹脂、熱硬化性樹脂、
反応型樹脂、電子線照射硬化型樹脂との混合物が使用さ
れてもよい。Furthermore, in addition to the above binders, thermoplastic resins, thermosetting resins,
A mixture of a reactive resin and an electron beam curable resin may be used.
本発明の磁気記録媒体の磁性層の耐久性を向上させるた
めに磁性塗料に各種硬化剤を含有させることができ、例
えばイソシアナートを含有させることができる。In order to improve the durability of the magnetic layer of the magnetic recording medium of the present invention, the magnetic paint can contain various curing agents, for example, isocyanate.
芳香族インシアナートとしては、例えばトリレンジイソ
シアナート（ＴＤＩ）等及びこれらイソシアナート活性
水素化合物との付加体などがあり、平均分子量としては
１００〜３．０００の範囲のものが好適である。Examples of aromatic incyanates include tolylene diisocyanate (TDI) and adducts of these isocyanates with active hydrogen compounds, and those having an average molecular weight of 100 to 3.000 are suitable.
また脂肪族インシアナートとしては、ヘキサメチレンジ
イソシアナート（ＨＭＤＩ）等及びこれらイソシアナー
トと活性水素化合物の付加体等が挙げられる。これらの
脂肪族インシアナート及びこれらインシアナートと活性
水素化合物の付加体などの中でも、好ましいのは分子量
が１００〜３．０００の範囲のものである。脂肪族イソ
シアナートのなかでも非脂環式のインシアナート及びこ
れら化合物と活性水素化合物の付加体が好ましい。Examples of aliphatic incyanates include hexamethylene diisocyanate (HMDI) and adducts of these isocyanates and active hydrogen compounds. Among these aliphatic incyanates and adducts of these incyanates and active hydrogen compounds, those having a molecular weight in the range of 100 to 3,000 are preferred. Among the aliphatic isocyanates, non-alicyclic incyanates and adducts of these compounds with active hydrogen compounds are preferred.
磁性層を形成するのに使用される磁性塗料には必要に応
じて分散剤、潤滑剤、研磨剤、マット剤、帯電防止剤等
の添加剤が含有させられる。The magnetic paint used to form the magnetic layer may contain additives such as a dispersant, a lubricant, an abrasive, a matting agent, and an antistatic agent, if necessary.
本発明に使用される分散剤としては、たとえば燐酸エス
テル、アミン化合物、アルキルサルフェート、脂肪酸ア
ミド、高級アルコール、ポリエチレンオキサイド、スル
ホ琥珀酸、スルホ琥珀酸エステル、公知の界面活性剤等
及びこれらの塩があり、また、陰性有機基（例えば−〇
〇ＯＨ）を有する重合体分散剤の塩を使用するこ、とも
出来る。Dispersants used in the present invention include, for example, phosphoric acid esters, amine compounds, alkyl sulfates, fatty acid amides, higher alcohols, polyethylene oxides, sulfosuccinic acids, sulfosuccinic esters, known surfactants, and salts thereof. It is also possible to use a salt of a polymeric dispersant having a negative organic group (eg -00OH).
これら分散剤は１種類のみで用いても、或は２種類以上
を併用してもよい。These dispersants may be used alone or in combination of two or more.
潤滑剤としては、たとえばシリコーンオイル、グラファ
イト、カーボンブラックグラフトポリマ、二硫化モリブ
テン、二硫化タングステン、ラウリル酸、ミリスチン酸
、炭素原子数１２〜１６の一塩基性脂肪酸と該脂肪酸の
炭素原子数と合計して炭素原子数が２１〜２３（Ｗの一
価のアルコールから成る脂肪酸エステル（いわゆる蝋）
等も使用できる。Examples of lubricants include silicone oil, graphite, carbon black graft polymer, molybdenum disulfide, tungsten disulfide, lauric acid, myristic acid, monobasic fatty acids having 12 to 16 carbon atoms, and the total number of carbon atoms in the fatty acids. Fatty acid ester (so-called wax) consisting of a monohydric alcohol with 21 to 23 carbon atoms (W)
etc. can also be used.
これらの潤滑剤は結合剤１００重量部に対して、通常、
０．２〜２０重量部の範囲で添加される。These lubricants are usually used for 100 parts by weight of binder.
It is added in an amount of 0.2 to 20 parts by weight.
研磨剤としては、一般に使用される材料で熔融アルミナ
、αアルミナ等の各種アルミナ、炭化珪素、酸化クロム
、コランダム、人造コランダム、人造ダイヤモンド、ざ
くろ石、エメリ（主成分：コランダムと磁鉄鉱）等が使
用される。これらの研磨剤は平均粒子径０．０５〜５μ
ｍの大きさのものが使用され、特に好ましくは０．１〜
２μ電である。これらの研磨剤は、通常、結合剤１００
重量部に対して、１〜２０重量部の範囲で添加される。As abrasives, commonly used materials such as fused alumina, various aluminas such as alpha alumina, silicon carbide, chromium oxide, corundum, artificial corundum, artificial diamond, garnet, and emery (main components: corundum and magnetite) are used. be done. These abrasives have an average particle size of 0.05 to 5μ
m is used, particularly preferably 0.1 to
It is 2μ electric current. These abrasives typically have a bonding agent of 100%
It is added in an amount of 1 to 20 parts by weight.
マット剤としては、有機質粉末或は無機質粉末を夫々に
或は混合して用いられる。As the matting agent, organic powder or inorganic powder may be used individually or in combination.
本発明に用いられる有機質粉末としては、アクリルスチ
レン系樹脂、ベンゾグアナミン系樹脂粉末、メラミン系
樹脂粉末、フタロシアニン系顔料が好ましいが、ポリオ
レフィン系樹脂粉末、ポリエステル系樹脂粉末、ポリア
ミド系樹脂粉末、ポリイミド系樹脂粉末、ポリ弗化エチ
レン樹脂粉末等も使用でき、無機質粉末としては酸化珪
素、酸化チタン、酸化アルミニウム、炭酸カルシウム、
硫酸バリウム、酸化亜鉛、酸化錫、酸化アルミニウム、
酸化クロム、炭化珪素、炭化カルシウム、ａ−Ｆｅオ０
３、タルり、カオリン、硫酸カルシウム、窒化硼素、弗
化亜鉛、二酸化モリブデンが挙げられる。As the organic powder used in the present invention, acrylic styrene resin, benzoguanamine resin powder, melamine resin powder, and phthalocyanine pigment are preferable, but polyolefin resin powder, polyester resin powder, polyamide resin powder, and polyimide resin are preferred. Powder, polyfluoroethylene resin powder, etc. can also be used, and inorganic powders include silicon oxide, titanium oxide, aluminum oxide, calcium carbonate,
barium sulfate, zinc oxide, tin oxide, aluminum oxide,
Chromium oxide, silicon carbide, calcium carbide, a-FeO0
3. Tartar, kaolin, calcium sulfate, boron nitride, zinc fluoride, and molybdenum dioxide.
帯電防止剤としては、カーボンブラックをはじめ、グラ
フフィト、酸化錫−酸化アンチモン系化合物、酸化チタ
ン−酸化錫−酸化アンチモン系化合物などの導電性粉末
、サポニンなどの天然界面活性剤：アルキレンオキサイ
ド系、グリセリン系、グリシドール系などのノニオ、ン
界面活性剤、高級アルキルアミン類、第４級アンモニウ
ム塩類、ピリジン、その他の複素環類、ホスホニウムま
たはスルホニウム類などのカチオン界面活性剤、カルボ
ン酸、スルホン酸、燐酸、硫酸エステル基、燐酸エステ
ル基等の酸性基を含むアニオン界面活性剤、アミノ酸類
、アミノスルホン酸類、アミノアルコールの硫酸または
燐酸エステル類等の両性活性剤などがあげられる。Antistatic agents include carbon black, conductive powders such as graphite, tin oxide-antimony oxide compounds, titanium oxide-tin oxide-antimony oxide compounds, natural surfactants such as saponin, alkylene oxide compounds, Nonionic surfactants such as glycerin and glycidol, higher alkyl amines, quaternary ammonium salts, pyridine and other heterocycles, cationic surfactants such as phosphonium or sulfonium, carboxylic acids, sulfonic acids, Examples include anionic surfactants containing acidic groups such as phosphoric acid, sulfuric ester groups, and phosphoric ester groups, and amphoteric surfactants such as amino acids, aminosulfonic acids, and sulfuric or phosphoric esters of amino alcohols.
上記塗料に配合される溶媒或はこの塗料の塗布時の希釈
溶媒としては、アセトン、メチルエチルケトン、メチル
イソブチルケトン、シクロヘキサノン等のケトン類、メ
タノール、エタノール、プロパツール、ブタノール等の
アルコール類；酢酸メチル、酢酸エチル、酢酸ブチル、
乳酸エチル、エチレングリコールモノアセテート等のエ
ステル類、グリコールジメチルエーテル、グリコールモ
ノエチルエーテル、ジオキサン、テトラヒドロフラン等
のエーテル類、ベンゼン、トルエン、キシレン等の芳香
族炭化水素、メチレンクロライド、エチレンクロライド
、四塩化炭素、クロロホルム、ジクロルベンゼン等のハ
ロゲン化炭化水素等のものが使用できる。Solvents to be added to the above paint or diluting solvents during application of this paint include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; alcohols such as methanol, ethanol, propatool, and butanol; methyl acetate; ethyl acetate, butyl acetate,
Esters such as ethyl lactate and ethylene glycol monoacetate, ethers such as glycol dimethyl ether, glycol monoethyl ether, dioxane, and tetrahydrofuran, aromatic hydrocarbons such as benzene, toluene, and xylene, methylene chloride, ethylene chloride, carbon tetrachloride, Halogenated hydrocarbons such as chloroform and dichlorobenzene can be used.
また、支持体としては、ポリエチレンテレフタレート、
ポリエチレン−２，６−す７タレート等のポリエステル
類、ポリプロピレン等のポリオレフィン類、セルロース
トリアセテート、セルロースダイアセテート等のセルロ
ース誘導体、ポリアミド、ポリカーボネートなどのプラ
スチックが挙げられるが、Ｃｕ、 ｋＱｓ Ｚｎ等の金
属、ガラス、窒化硼素、Ｓｉカーバイド等のセラミック
スなども使用できる。In addition, as a support, polyethylene terephthalate,
Examples include polyesters such as polyethylene-2,6-7-talate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate and cellulose diacetate, and plastics such as polyamide and polycarbonate, but also metals such as Cu, kQs, Zn, etc. Glass, boron nitride, ceramics such as Si carbide, etc. can also be used.
これらの支持体の厚みはフィルム、シート状の場合は約
３〜１００μｍ程度、好ましくは５〜５０μｍであり、
ディスク、カード状の場合は３０μｍ＝１０ｍｍ程度で
あり、ドラム状の場合は円筒状で用いられ、使用するレ
コーダに応じてその型は決められる。The thickness of these supports is about 3 to 100 μm in the case of a film or sheet, preferably 5 to 50 μm,
In the case of a disk or card, the diameter is approximately 30 μm = 10 mm, and in the case of a drum, a cylindrical shape is used, and the shape is determined depending on the recorder used.
上記支持体と磁性層の中間には接着性を向上させる中間
層を設けても良い。An intermediate layer for improving adhesion may be provided between the support and the magnetic layer.
支持体上に上記磁性層を形成するための塗布方法として
は、エアーナイフコート、ブレードコート、エアーナイ
フコート、スクイズコート、含浸コート、リバースロー
ルコート、トランスファロールコート、グラビアコート
、キスコート、キャストコート、スプレィコート、エク
ストルーダ３ンコート等が利用できるが、これらに限ら
ない。Coating methods for forming the magnetic layer on the support include air knife coating, blade coating, air knife coating, squeeze coating, impregnation coating, reverse roll coating, transfer roll coating, gravure coating, kiss coating, cast coating, Spray coating, extruder triple coating, etc. can be used, but are not limited to these.
これらのコート法によって支持体上に磁性層を構成させ
る場合、−層ずつ塗布乾燥工程を積み重ねる方式（いわ
ゆるウェット・オン・ドライ塗布方式）と乾燥されてい
ない湿潤状態にある層の上に次の層を同時または逐次重
ねて塗布する方式（いわゆるウェット・オン・ウェット
塗布方式とがあるが、本発明の磁気記録媒体の製造に当
たっては、いずれの方式を採ることもできる。When constructing a magnetic layer on a support using these coating methods, there are two methods: one method involves stacking the coating and drying steps layer by layer (so-called wet-on-dry coating method), and the other method involves stacking the coating and drying steps layer by layer (so-called wet-on-dry coating method). There is a method in which layers are coated simultaneously or sequentially (a so-called wet-on-wet coating method), but either method can be used in manufacturing the magnetic recording medium of the present invention.
なお、本発明の効果をそこなわない上で、磁性層と磁性
層の上下若しくは中間に非磁性層を設けても良い。Note that a nonmagnetic layer may be provided above and below or between the magnetic layers without impairing the effects of the present invention.
磁性層の膜厚に関しては、膜厚を余りにも厚くすること
は、効果の点から見て好ましくないので、本発明におい
ては、通常、最上層の膜厚は１．５μｍ以下にすること
が好ましい。Regarding the thickness of the magnetic layer, it is not preferable to increase the thickness too much from the viewpoint of effectiveness, so in the present invention, it is usually preferable that the thickness of the top layer is 1.5 μm or less. .
支持体上に塗布された磁性層は必要により層中の強磁性
金属酸化物粉末を配向させる処理を施したのち、形成し
た磁性層を乾燥する。The magnetic layer coated on the support is optionally treated to orient the ferromagnetic metal oxide powder in the layer, and then the formed magnetic layer is dried.
この場合、配向磁場は交流または直流で約５００〜５０
００ガウス程度であり、乾燥温度は約５０〜１２０℃程
度、乾燥時間は約０．１〜１０分間程度である。In this case, the orientation magnetic field is approximately 500 to 50
00 Gauss, the drying temperature is about 50 to 120°C, and the drying time is about 0.1 to 10 minutes.
また、必要に応じて表面平滑化処理を施したり、所望の
形状に裁断したりして、本発明の磁気記媒体を製造する
。Further, the magnetic recording medium of the present invention is manufactured by subjecting it to surface smoothing treatment or cutting it into a desired shape, if necessary.
次に、実施例により零発、明を説明するが、いうまでも
なく本発明はこの実施例により限定されるものではない
。Next, the invention will be explained with reference to Examples, but it goes without saying that the present invention is not limited to these Examples.
第１表および第２表に記載した処方の最上層用および最
上層に隣接する暦月の磁性塗料を良く混練した後、硬化
剤としてポリイソシアネート［日本ポリウレタン工業（
株）製、商品名 コロネートし］を５重量部添加して、
塗布用磁性塗料を調製した。After thoroughly kneading the magnetic paints for the top layer and calendar months adjacent to the top layer of the formulations listed in Tables 1 and 2, a polyisocyanate [Japan Polyurethane Industry Co., Ltd.] was added as a hardening agent.
Co., Ltd., product name: Coronate] was added in an amount of 5 parts by weight.
A magnetic paint for coating was prepared.
ついで、最上層用磁性塗料および最上層に隣接する暦月
の磁性塗料を常法にしたがい、支持体上に重層塗布した
のち、磁場配向処理し、乾燥処理をして磁気記録媒体を
製造した。Next, the magnetic paint for the uppermost layer and the magnetic paint for the calendar month adjacent to the uppermost layer were coated in multiple layers on the support according to a conventional method, and then subjected to magnetic field orientation treatment and drying treatment to produce a magnetic recording medium.
このようにして得られた磁気記録媒体について電磁変換
特性の測定および耐環境性のテストを行っ
た。The magnetic recording medium thus obtained was measured for electromagnetic conversion characteristics and tested for environmental resistance.
各実施例および比較例において用いた強磁性体合金粉末
の種類と磁性層の膜厚を第３表に、そ
し
第
表
〈最上層に隣接する暦月磁性塗料〉
棗
合金の種類は第３表に記載。The type of ferromagnetic alloy powder and the film thickness of the magnetic layer used in each example and comparative example are shown in Table 3, and Table 3 (Calendar magnetic paint adjacent to the top layer) The type of jujube alloy is shown in Table 3. Described in.
第
表〈最上層用磁性塗料〉
第３表く使用した強磁性合金の種類と磁性層の膜厚〉第
４表〈磁気記録媒体の特性〉
第４表から明らかなように、本発明の磁気記録媒体は耐
環境性に優れていると共に、耐環境性テストの前後を通
じて、ルミＳ／ＮおよびクロマＳ／Ｎ等の電磁変換特性
がバランス良く高い水準を維持している。Table 4: Magnetic paint for the top layer Table 3 Types of ferromagnetic alloys used and thickness of magnetic layer Table 4 Characteristics of magnetic recording medium As is clear from Table 4, the magnetic coating of the present invention The recording medium has excellent environmental resistance, and electromagnetic conversion characteristics such as lumi S/N and chroma S/N maintain a well-balanced and high level before and after the environmental resistance test.
これに対して、本発明に従わない磁気記録媒体（比較例
）は、耐環境性および電磁変換特性のいずれも高い水準
にあるとは言えない（比較例２）か、または耐環境性は
良好であっても、電磁変換特性の水準が必ずしも高いも
のとは言えず、かつそのバランスも良いものとは言えな
い（比較例１，３および４）。On the other hand, magnetic recording media that do not comply with the present invention (comparative examples) cannot be said to have high levels of both environmental resistance and electromagnetic conversion characteristics (comparative example 2), or have good environmental resistance. Even so, the level of electromagnetic conversion characteristics cannot necessarily be said to be high, and the balance thereof cannot be said to be good either (Comparative Examples 1, 3, and 4).
〈実施例および比較例における特性の測定法〉・ルミＳ
／Ｎ
磁気記録媒体上にホワイｌ−１００％の信号を基準レベ
ルで入力、再生ビデオ信号を９２１Ｄ／ｌ ［（株）シ
バツク製ノイズメーター１に入力し、得られるノイズ絶
対値よりルミＳ／Ｎを読み取る。<Method for measuring properties in Examples and Comparative Examples> Lumi S
/N Input the white 100% signal on the magnetic recording medium at the reference level, and input the reproduced video signal to the noise meter 1 manufactured by Shibaku Co., Ltd., and calculate Lumi S/N from the absolute noise value obtained. Read.
・クロマＳ／Ｎ
シバツク社製、ノイズメーターを使用し、基準テープと
の比較において、クロマ信号における試料のＳ／Ｎの差
を求めた。- Chroma S/N Using a noise meter manufactured by Shibatsu Co., Ltd., the difference in S/N of the sample in the chroma signal was determined in comparison with the reference tape.
・耐環境性（Ｂ＋＋＋ ’／Ｂ＋ａ）
試料テープの耐環境性テスト後における電磁変換特性の
測定値（Ｂｍ ’）に対するテスト前の測定値（Ｂｍ）
を百分率で示したもの。・Environmental resistance (B+++'/B+a) Measured value (Bm) of electromagnetic conversion characteristics before the test versus measured value (Bm') of the electromagnetic conversion characteristics after the environmental resistance test of the sample tape
expressed as a percentage.
なお、耐環境性テストは温度６０°Ｃ１相対湿度８０％
の下に試料テープを７日間放置して行った。In addition, the environmental resistance test was conducted at a temperature of 60°C and a relative humidity of 80%.
The test was carried out by leaving the sample tape under the tube for 7 days.
本発明め磁気記録媒体は、高温高温条件下のような苛酷
な条件下においても電磁変換特性の劣化が少なく、耐環
境性に優れているばかりか、このような耐環境性テスト
の前後を通じて電磁変換特性がバランス良く高い水準を
維持している。The magnetic recording medium of the present invention has excellent environmental resistance with little deterioration in electromagnetic conversion characteristics even under harsh conditions such as high temperature conditions, and it also has excellent environmental resistance before and after such environmental resistance tests. The conversion characteristics are well-balanced and maintain a high level.
出願人 コニカ株式会社Applicant: Konica Corporation
Claims (1)
体において、最上層中の磁性体がＦｅ−Ａｌ系強磁性合
金粉末であり、かつ最上層に隣接する層中の磁性体がＦ
ｅ−Ｎｉ系強磁性合金粉末であることを特徴とする磁気
記録媒体。(1) In a magnetic recording medium comprising multiple layers on a non-magnetic support, the magnetic material in the top layer is Fe-Al based ferromagnetic alloy powder, and the magnetic material in the layer adjacent to the top layer is F
A magnetic recording medium characterized by being made of e-Ni-based ferromagnetic alloy powder.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1079307A JPH02257420A (en) | 1989-03-29 | 1989-03-29 | Magnetic recording medium having excellent electromagnetic conversion characteristics against environment |
| EP90302944A EP0390391B2 (en) | 1989-03-28 | 1990-03-19 | A magnetic recording medium with improved electromagnetic conversion characteristics and anti-environment properties |
| DE69019220T DE69019220T3 (en) | 1989-03-28 | 1990-03-19 | Magnetic recording medium with improved electromagnetic conversion characteristics and protection against environmental influences. |
| KR1019900004095A KR100217530B1 (en) | 1989-03-28 | 1990-03-27 | A magnetic recording medium with improved electromagnetic conversion characteristics and anti-environment properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1079307A JPH02257420A (en) | 1989-03-29 | 1989-03-29 | Magnetic recording medium having excellent electromagnetic conversion characteristics against environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02257420A true JPH02257420A (en) | 1990-10-18 |
Family
ID=13686194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1079307A Pending JPH02257420A (en) | 1989-03-28 | 1989-03-29 | Magnetic recording medium having excellent electromagnetic conversion characteristics against environment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02257420A (en) |
-
1989
- 1989-03-29 JP JP1079307A patent/JPH02257420A/en active Pending
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